Home Search GeoAstro Applets Astronomy Chaos Game Java Miscel- laneous Physics Quiz Who is Who ?

Azimuth and Elevation Applet

More details:

Diagrams of the elevation and the azimuth of the Sun for various latitudes and dates (exinoxes and solstices), generated by this applet

Select your location from the menu list, or enter the coordinates (decimal degrees) for the latitude (southern negative), and for the longitude (western negative),  then hit the button "Apply input": In the azimuth diagram the red part of the curve indicates that the sun is above horizon, in case of blue the sun has set:  Choose from the menu to get different diagrams, tables, and charts.

Get time of azimuth: Get times of elevation: Choose Day from the menu to get this window:   Choose AZ/ELEV Chart from the menu

The Graph below helps estimate source rising and setting.
It is a plot of elevation vs. azimuth, with lines of constant
hour angle (red) and declination (blue) indicated. The lines of constant declinations are plotted in increments of 10 degrees, while the lines of constant hour angle are plotted in increments of 1 hour.

Example for 52.5°N:

Declination of the Sun 20°, sunrise (elevation 0°) is about 8 hours before noon at an azimuth angle of about 55°.    Choose Table from the menu to get this data window: Choose Get Time from the menu to compute the time
for a given azimuth angle: The azimuth and elevation angle are the coordinates of the observer's local horizontal system:
the azimuth is the angular distance measured along the horizon (in nautics 0°=N, 90°= E,
180°=S, 270°= W), the elevation is the angular distance measured above the horizon. For a location of latitude beta the elevation angle of the sun at local noon is:

elev. angle = 90° - beta + declin

where declin is the declination angle of the sun.

Example: beta= 50° North

delta=23.5° on June 21:

elev. angle = 90° - 50° + 23.5° = 63.5°

delta=-23.5° on Dec. 21:

elev. angle = 90° - 50° - 23.5° = 16.5°  Please visit my: GeoAstro Applet Collection

 Web Li SunPosition Calculator 